What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

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Solution

If the reflected ray is at an angle of 90° to the incident ray, then the angle of incidence is 45 °. According to the law of reflection, the angle of incidence is equal to the angle of reflection. Therefore, the angle of incidence and the angle of reflection both are = 45°.

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